Extract files from FMapDat.dat found in Mario & Luigi: Dream Team. EXTREMELY FINECKY/HACKY AND UNFINISHED!!!

fmap_dump.py

import os

# EDIT THESE TWO PATHS AS NEEDED
fmap_path = "./FMapDat.dat"
extract_dir = "./extract"
# EDIT THESE TWO PATHS AS NEEDED

os.makedirs(extract_dir, exist_ok=True)

fmap_file = open(fmap_path, "rb")
file_size = fmap_file.seek(0, 2)
fmap_file.seek(0)

origin = 0x0
index = 0x0
while True:
    if origin > file_size: break

    fmap_file.seek(origin)
    while fmap_file.read(1) != b"\x68":
        origin += 1
        fmap_file.seek(origin)

    fmap_file.seek(origin + 0x60)
    offset = int.from_bytes(fmap_file.read(4), "little")
    size = int.from_bytes(fmap_file.read(4), "little")

    if size == 0:
        print("End of file")
        print(hex(origin))
        print(hex(offset))
        print(hex(size))
        break

    print(f"Offset: {offset:08X}")
    print(f"Size: {size:08X}")

    file_offset = origin + offset

    f = open(extract_dir + "/" + str(f"{index:04d}_{file_offset:08X}") + ".bin", "wb")

    fmap_file.seek(file_offset)
    f.write(fmap_file.read(size))

    f.close()

    origin = fmap_file.tell()
    print(f"Origin: {origin:08X}")

    index += 1

fmap_file.close()